Reactive coil.



w. s. MOODY,

REAOTIVE COIL.

A1PLIGATEON FILED JULY 1]., 1912v 1,132,281. Patented Mar. 16, 1915 MT ESSES I [NVENYUH v )3 WALTER 5/1/1005? 5% {4k M mm 5 4 [-175 A7" TORNEY UNITED STATES PATENT OFFICE.

WALTEBREGUDY UF BITTSFIELI), MASSACHUSETTS, ASSIGNOR TD GENERAL ELEC-ifilifi JJQKPANY, AGOBPORATION CF NEW YORK.

EEAQTIVE COIL.

Specification 0; Letters Patent.

Patented Mar. 1 3,

Application fled. July 13, 19-12. Serial $0. 70858-L2.

'To aZZ whom it may concem i291 coil is 'hctter arrangements thereof than he hcresoioreheen used.

Reactive coils are used, in general, in systems of distribution protect some part of the system from i pozentiols originating on other parts of e system. I propose to construct'the reactive coil, in its most complete form. in the shape of two cones joined at their bases, such e coil absorbing more eq'ually'throughout a greater portionof it-' self than do the coils in use prior to my 1nvention, on electromotive force suddenly impressedon it. Where'tbe-end'turns'o'f a reactive coil are of a maximum diameter, as

has been the practice, the increasing eiectromotive force suddenly meets the maximum resistance, since, yes is well understood, the greater the radius of curvature of turn, the greater the resistance ofl'ered by it to an increasing potential by reason of its reactance.

Where new invention is used. however, the resistsnce first presented to the electromotive force is small, gradually increasing as the electromotive force passes farther into the coil.

T he stresses are, therefore, more equally dis-' trihuted throughout a greater portion or the coil, there is less tendency for a few turns to move together and less tendency for arei'ng between turns. The action of an electromotive force suddeniy impressed 'on a coil such as I propose, may he described as similar to the action of an ocean Wave striking a sloping heach Where the force of the Wave is gradually d ssipated as the wave rolis up the heach. When a wave strikes a vertical cliff, however, the arresting of the force of the Wave is sudden, as is the arresting of an eiectroniotiveforce wave by a coil presenting its maximum diameter turns to the a, reactive coil is to he used topmect piece of apparatus from disturbances which may he expected to occur on onlv one side oi that apparatus. the reactive coil may he simplified 'hy making it in the shape of a single cone, in which case the installation the coil. As a port in this-support? should he in such a wa that apex of thccone is connected to that 51(16 the system on which the disturbances may be expected to occur.

Figure 1 shows in elevation a reactive coil involving my invention; Fig. 2 illustrates diagrammaticaliy the use of two such coils to protect a generator; Fi e. 3 iilustrutes diagrammaticaily the use of the siinpiified form. of coil to protect a generator.

As shown in Fig. 1. the coil 1 structed as to represent two cones their hoses. To support t its ends secure-1y together,

sired form and construction, fer the construction shown, pia

provided the members which connect the center 0:" the coii to the insulator and thereby help to fix the coil thereto. The coii is 'iikewise connected to the insulator h; the

cups 4 at each end of the coil. Whenever this coil is inserted in a line, the longitudinal strain of the line on the coil will he carried by the insulator and the relation of tlie turns to each other will be unchanged by the tensionai strain'o'f the line. When cur-- rent is passing through such a soil, the varione turns have some tendency to move together and shorten the distances themselves, although this tendency is not so evident in a coil of the form I have pronosed as the coils heretofore known. This may iced to the short circuiting of the turns. or to arcing between them. To pre vent this action various provisions he made. I prefer to provide insuiating bars 5 carrying turns of the coii through se, rate openings. For ease of construction sac. bur :mav' he made of two members Melted to gether as shown inthe airings. Such a coil may be counecied into any part of the system of distribution. for example, as shown in Fig. 2, and will hold its shape under considerable mechanical and electrical stresses. .The supporting insulator and insulating bars, being provided for the purposes in dicated, may be dispenser; with WhQEl-T-VET" thev are not rsouired. Any shnorma .-ies to he ahsorbed bv the coil. originating on either side of it. will be absorbed more grad uallv by a coil of the shape indicated than by the coils heretofore known, since the coil presents, from the end to the center, a grad;

between uall increasin resistance to an electromotire force wave-from either direction. As is well known, the length'of a turn, and hence its radius, is a factor of its self inductance and resistance to a passing wave. By gradu I be constructed of the shape shown in Fig. 3,

a single cone. The apex 7 thereof should be connected to the side 8 of the system on which the abnormal tendencies may be expected to originate; for example, the coil in Fig. 3 is used to protect the generator 9 from disturbances occurring at 8 or beyond. Such a coil may or may not be provided with either or both the supporting insulator and the means for maintaining the proper relation of the turns toe'ach other as desired.

What Iclaim as new and desire to secure by Letters Patent of the United States, is

1. The combination with a system of dis tribution, of a reactive coil in one lead thereof, the radius of curvature of a turn of the reactive coil near one end being less than the radius of curvature of a turn situated farther from that end, said mentioned end of the coil being connected to that part of the system on which the disturbances tobe protected against by the coil may be expected to occur.

2. The combination with a system of dis tribution, of electrical apparatus connected thereto and a reactive coil connected between the apparatus and a part of the system on which disturbances may be expected to oc- 4. A reactive coil having a plurality of turns the radii of curvature of which increase from the ends toward' the center.

5. The combination with a reactive coil in the shape of a double cone with bases adjoining, of means for maintaining the spacing of turns of said coil comprising a plurality of bars secured to the several turns and insulating means within the coil connecting its two ends securely together.

In witness whereof, I have hereunto set my hand this 9th day of July 1912.

WALTER S. MOODY. Witnesses:

' G. FACCIOLI,

C. R. BLAKELY.

Copies of this patent; may be obtained for Me cents each..by addressing the Commissioner at latents,

' Washington, D. C. 

